Jointer attachment for a portable hand saw



May 10, 1955 E. HOLT JOINTER ATTACHMENT FOR. A PORTABLE HAND SAW Filed March 8, 1954 INVENTOR.

Edward Ho/f 3Y7 ATTORNEY United States Patent JOINTER ATTACHMENT FOR .A PORTABLE HAND SAW Edward Holt, Dallas, Tex.

Application March 8, 1954, Serial No. 414,600

Claims. '(Cl. 145 20) This invention relates to planers or jointers and more particularly to a jointer attachment for power hand saws.

Planers and jointe'rs, designed for attachment to and operation by electric hand saws are not broadly new but in practice, conventional attachments of this type have been found to be bulky, difficult to manipulate on the Work and devoid of certain features which would lend greater practicability to this type of power saw attachment. Besides the need for reducing the weight of an attachment -of this type, it is desirable that a jointer be gearless and driven by the power'element with the shortest belt possible to reduce hazard and further, a sectional 'fence is needed in which one section is stationary While the other is adjustable to a variety of angles in relation to the bed. In addition to their desirable features, it is important that the rotary cutter be adjustable perpendicularly'to the bed to compensate for wear and that sim ple means-be provided for adjusting the shoe of the jointer according to predetermined 'gradua'tions for accurate cutting depth.

it is the principal object of the invention, therefore, to provide a planer or jointer attachment for electric power hand saws which is exceptionally light in weight and has a cutter located in such relation to the drive spindle of a power hand saw frame to which the jointer is attached that only a very short driving belt is necessary to trans mit rotation to the cutter shaft. Moreover, the invent-ion provides a stationary and an adjustable fence, combined with adjustments for the rotary cutter and the shoe which determines the depth of cut of the cutter.

Another object of the invention is to provide a planer or 'jointer equipped with means 'for accommodating the jointer to many types of electrically powered hand saws.

Other objects will become manifest as the description proceeds when considered with the annexed drawing, wherein:

Figure l is a side elevational view of the jointer attached to a power hand saw of conventional manufacture.

Figure 2 is a view in longitudinal sectionof the attachment on a larger scale.

Figure 3 is a top plan view of the attachment.

Figure 4 is a front end elevational view of the attachment.

Figure 5 is a transverse sectional view taken on line 5 5 of "Figure 3. I Figure 6 is a perspective view of a pulley employed for driving the cutter, and V Figure 7 is a perspective view of a hollow pulley re- 'ceiving the pulley shown in Figure 6 for changing the rotary speed of the cutter and for reducing frictional heat.

Continuing with a more detailed description of the drawing, reference numeral 10 denotes generally a conventional power hand saw frame from which the'saw has been removed, and which is equipped with the usual shoe 11 having upturned ends 12.

The 'jointer consists of an elongate frame generally designated by numeral '13 composed of a hollow molded or cast body of substantially "rectangular shape in trans ice 'versesection, as depicted in Figure 5, having a top 14, a bottom 15' and side walls 16 and 17 respectively. Secured by means of screws 18'to the bottom 15 of the frame 13 is a bed plate 19 which extends from the rear of the frame "to a point forwardly of its midsection where it confronts a bridge 20 :(Figure 2) across an opening 21 in which operates the rotary cutter 22, to which further reference will be made'presently. The bridge 20 is a part 'of the bottom 15 of the frame 13'but is slightly depressed to provide relief for the work against which bears the bed-plate 19. The bridge is provided with a downwardly and rearwa-rdly turned lip 23 to pass chips and shavings, released by the cutter, through a discharge opening 24, guided therethrough by a curved bafile 25 interposed between the walls, top and bottom of the frame 13 and held therein by screws 26.

Immediately forward of the bridge 20 is a transverse slot 27 which receives the upwardly curved end 28 of a shoe 29. T he'shoe 29 extends forwardly of the frame and its forward portion 30 is turned upwardly and rearwardly at an acute angle which'corresponds to the angle of nose 31 of the jointer and against which the portion 30 of the shoe 29 bears in flush sliding engagement. The portion 30 of the shoe 29 has a longitudinal slot 32 (Figure 2 which receives a bolt 33 which is threaded through a hole allelism of the latter with the bed plate 19 at all times while causing the shoe to recede or retract in relation to a plane intersecting the cut made by the cutter 22.

-'It will be observed in Figure 2 that the angle of the upwardly curved end 28 of the shoe 29 is generally parallel with the forward portion 30 and is always in contiguous engagement with the forward edge of the slot 27 through which it extends. The length of the upturned end 28, of course, determines the degree of downward displacement of the shoe and it always remains in the slot 27 whose forward edge serves as :a bearing point to support the rear end of the shoe as the latter is forwardly and downwardly displaced by downward and forward movement of the portion 30 thereof. By virtue of this support and in view of the corresponding angle of the upturned portion 28 and the portion 30 of the shoe, the latter remains throughout its length in parallel relationship with the frame bottom in all positions of its adjustment.

The cutter 22 is of substantially S-forrn, having opipositely curved blades 37 (Figure 2) and is mounted on'a transverse shaft 38. Inverted U-shaped recesses 39 are made in the walls 16 and 17 of the frame 13 to receive the shaft 38, the ends of the latter being journale'd one in a frictionless bearing 39 and the other in a like hearing 40. The bearing 39 is mounted in the circular housing 41 which is an integral part of an arm 42 whose end opposite the housing is pivoted by means of a set screw 43 to the side 17 of the frame 13. A second set screw 44 extends through a slot 44a in the arm 42 and enters a threaded opening in a longitudinal side plate 45 (Figure '5) "affixed by screws 46 to the side wall 17 of the frame 13. In like manner, the bearing 40 is mounted in a circular housing 47 carried by an arm 48 which is identical to arm 42 except that it reversed. The arm 48 is secured by a set screw 49 to the wall 16 of the frame 13 and a similar set screw 50 extends through a slot in the-arm 48 and into a threaded opening in the wall 16. in :this manner, the arms 42 and 48 may "be oscillated slightly tor-aise and lower the cutter shaftand the cutter 3 22. This adjustment is desirable since the sharpening of the cutter blades 37 reduces the effective cutting diameter of the cutter and by moving the cutter outwardly after each sharpening, the reduction in the diameter of the cutting range is compensated for.

It will be observed in Figure 2 that a curved plate 51 is interposed between the top, bottom and side walls of the frame 13. This plate serves as a baffle to prevent cuttings from passing rearwardly into the frame.

The rear portion of the frame 13 is provided with elongate parallel slots 52 and mounted on the top 14 of the frame in transverse relationship with these slots is an L- shaped clamp 53. Screws 54 extend through holes made in one leg and the clamp and through the slots 52. A head 55 on the inner ends of these bolts prevents their release from the slots and wing nuts 56 threaded onto their opposite ends are, effective to hold the clamp 53 against the rear upturned end 12 of the shoe 11 of the saw frame 10. To hold the opposite or forward end of the shoe 11 in engagement with the jointer frame 13, the nose 31 of the latter has an extension 57, provided with a transverse recess 58 in its undersurface (Figure 2) into which is engaged the forward end 12 of the shoe 11 before tightening the wing nuts 56 to clamp the rear end of the shoe.

The drive shaft 59 of the motor 60 in the saw frame 10 extends outwardly over the side 16 of the jointer frame 13 and in close parallelism with the shaft 38 of the cutter 22. A pulley 61, having an integral collar 62, is mounted on one end of the cutter shaft immediately under a larger pulley 63 carried by the end of the motor drive shaft 59. A belt 64 surrounds the two pulleys 61 and 63, thereby driving the cutter from the motor 60 when the latter is energized by actuating the switch arm 65 adjacent the handle 660 on the saw frame 10.

The elongate side plate 45, previously referred to as extending longitudinally of the side 17 of the jointer frame 13, serves as a backing for a fence made up of two axially aligned sections, one of which is stationary while the other is movable. The stationary fence section 66 is an integral extension of the side 17 below the bottom 15 of the frame 13 and extends from the rear end of the frame 13 to a point opposite the lip 23 of the bridge 20 and is secured to the downwardly extending edge 67 (Figure of the backing plate 45 by screws 68. Conare curved outwardly and upwardly to engage in slots 71 in and spaced longitudinally of the side plate 45 opposite an adjacent edge of the shoe 29. These tongues 70 serve as hinges which permit the fence 69 to swing in the are suggested by the dotted lines in Figure 4. A curved bracket 72 is afiixed at one end to one side of the movable fence 69 near its forward end and has a curved slot 73 through which a bolt 74 extends into a threaded opening in a correspondingly curved bracket 75. The bracket 75 is stationarily secured to the side plate 45 by means of a mounting plate 75a (Figure 3). By turning the knurled head 76 of the bolt 74, the latter may be loosened to permit adjustment of the fence 69 to any desired angle in relation to the bed of the jointer.

Operation of the jointer is believed to be evident from the foregoing without necessity for a particular description of operation. As the jointer is moved along the work by means of the saw frame handle 66a, the cutter 22 removes a portion of the wood predetermined by the setting of the shoe 29. The cuttings are blown out and away from the jointer through the opening 24 in the side 16 of the jointer frame 13.

In Figure 7 is shown a detail view of a pulley flange 77 which is adapted to be slipped onto the pulley 61 in cases where there is a need for a speed change and which 'can be accomplished by increasing the effective diameter 4 of the pulley 61. This flange 77 also has the effect to minimize friction heat generated between the belt and pulley flange.

Manifestly, the construction as shown and described is capable of some modification, and such modification as may be construed to fall within the scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.

What is claimed is:

l. A jointer adapted for attachment to an electric hand saw frame having a drive shaft and a shoe, said jointer comprising an elongate hollow frame of substantially rectangular cross-section having declined front and rear ends, a stationary and a longitudinally movable clamping means on said frame for engaging the shoe of said hand saw frame, a bed plate on the undersurface of said rectangular frame terminating at one edge of a transverse slot in said undersurface forwardly of the midsection of said rectangular frame, an adjustable shoe extending from the opposite edge of said slot to the forward end of said rectangular frame and having its forward end turned upwardly and rearwardly into flush sliding engagement with said forwardly declined end for moving said adjustable shoe perpendicularly with respect to said rectangular frame, a rotary cutter operating in said transverse slot and having a shaft extending in parallelism with the shaft of said hand saw frame, means connecting said latter shaft and said cutter shaft for driving the latter, a stationary fence extending from the rear end of said frame to a point forwardly of said cutter, an adjustable fence pivoted along one edge of said rectangular frame in axial alignment with said stationary fence and extending to the forward end of said rectangular frame normally at right angles to the plane of said adjustable shoe, and means for holding said adjustable fence in adjusted posi- .tions in relation to said adjustable shoe.

2. A jointer adapted for attachment to an electric hand saw frame having a motor and operating shaft, said jointer comprising an elongate hollow frame, having a nose disposed at an angle to the longitudinal axis of said frame, means adjustable longitudinally on said hollow frame for its detachable connection to said saw frame, a rotary cutter having a transverse shaft journaled in said hollow frame forwardly of its midsection, means for driving said cutter shaft from the shaft of said hand saw motor, a bed plate extending from one end of said frame to said cutter having a transverse slot therein, a shoe extending from said cutter to the opposite end of said frame, having an upturned end bearing against one edge of said slot, means for adjusting said shoe longitudinally and perpendicularly withrespect to the plane of said bed, said adjusting means comprising a portion formed on the end of said shoe opposite said upturned end and disposed at an angle corresponding with that of said nose and in sliding engagement therewith, a stationary fence on one sideof said hollow frame extending from one end thereof to said shoe, a movable fence hinged to said hollow frame and extending from said stationary fence to the opposite end of said hollow frame and means for adjusting the angular position of said movable fence in relation to the plane of said bed plate.

3. In combinattion with a portable power hand saw frame having a motor and a driving shaft, a jointer attachment comprising an elongate frame having an inclined forward end, adjustable means for securing said elongate frame to said saw frame, a bed plate on the undersurface of said elongate frame extending from one end' and terminating at one edge of a transverse slot in said undersurface, a shoe extending from the opposite edge of said slot to the opposite end of said frame and havingan upwardly and rearwardly disposed portion in flush sliding engagement with the inclined end of said elongate frame for the adjustment of said shoe longitudinally of and perpendicularly to the plane of said bed plate, means for securing said shoe in adjusted position, a rotary cutter operating in said transverse slot having a shaft, means for driving said shaft from the driving shaft of said hand saw frame, a stationary fence on one side of and extending partially the length of said bed plate, a movable fence in axial alignment with said stationary fence and pivotally connected to said elongate frame at normally right angles to the plane of said shoe and arranged for adjustment to a variety of inclined positions in relation to said shoe and means for securing said movable fence in selected adjusted positions.

4. The structure of claim 3, means for raising and lowering the shaft of said cutter and means for directing cuttings from said cutter through an opening in one side of said elongate frame.

5. In combination with a portable power hand saw frame having a motor and a driving shaft, a jointer attachment comprising an elongate frame having an inclined forward end, adjustable means for securing said elongate frame to said saw frame, a bed plate on the undersurface of said elongate frame extending from one end and terminating at one edge of a transverse slot in said undersurface, a shoe extending from the opposite edge of said slot to the opposite end of said frame, and having its forward end disposed in a plane corresponding to and slidable on the inclined forward end of said frame to effect adjustment of said shoe longitudinally of and perpendicularly to the plane of said bed plate, means for securing said shoe in adjusted position, a rotary cutter operating in said transverse slot having a shaft, means for driving said shaft from the driving shaft of said hand saw frame, a movable fence in alignment with and pivotally connected to said elongate frame at normally right angles to the plane of said shoe and arranged for adjustment to a variety of inclined positions in relation to said shoe and means for securing said movable fence in selected adjusted positions.

References Cited in the file of this patent UNITED STATES PATENTS 1,706,157 Hannah Mar. 19, 1929 2,600,859 Drysdale June 17, 1952 2,649,873 Reich et al Aug. 25, 1953 

